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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14d2b48968b630d14286070d9018f3667aaec97aaeda9b9b3ddb0fbf039cdbb5' 
  AND token = 'j8OvUBWUB1KC8LMwCY9ae1m8m0f+RUKaRUjSkg2OdlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}